Relay.



s. R. STONE.

RELAY.

APPLICATION FILED AUG. 11 1911.

Patented J an. 6, 1914.

INVENTOR 12mm J3me BY WITNESSES; H. QM Mg ATTORNHS sruan'r n. scronn, on NEW YORK, N. Y.

- Specification of Letters Patent.

Application filed August 11, '1911.

Patented Jan. 6, 1914.

Serial No. 643,494.

To (ZZZ whom it may concern:

Be it known that I, STUART R. STONE, a citizen, of th United States, and a resident of the city or New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Relay, of which the following is a full, clear, and exact description.

My invention relates to relays for general use, and more particularly to a type of relay especially suitable for use in connection with fire alarm systems, annunciators and the like, where the purpose of the relay, directly or indirectly, as the case may be, is to control one or more alarms. 4

More particularly stated, my invention comprehends a relay provided with a douproved relay as employed for controlling a number of separate devices! including alarms of different lands, and also controlling movements of'a drop shutter, the 1llOV- able parts occupying their. respective normal positions, and Fig. 2 is a diagram somewhat similar to Fig. 1, but showing the movable parts as occupying their respective abnormal positions.

A magnet 3 is provided with an armature lever 4:, which is mounted upon a pivot 5 and adapted to swing in a vertical plane. A retracting spring 6 is connected with this armature lever for the purpose of normally keeping it raised, according to Fig. 1. The

armature lever 4L carries an insulating me 1 "her 8 and also a hook '7, this hook being. y virtue of the member 8, insulated fromthe armature lever, Below the armature lever is a contact button 9. A shutter hook is shown at 10 and is mounted to swing upon a pivot 11. A drop 12 is mounted upon a pivot 13 and is adapted to swing to the right, according to Figs. 1 and 2, whenever released by the shutter hook 10.

The magnet 3 is provided with poles 1 1-, 15', extending in'opposite directions. Adjacent to the pole 15 is an armature lever 16. which is mounted to swing upon a pivot 17. Disposed below the armature lever 10 is a contact button 18, which is adapted to be engaged by this armature lever when the latter is dropped, as hereinafter explained.

The parts above described constitute practically the mechanism of the relay, but

various auxiliary devices of the kindv shown may be employed in connection with the rela'y. In. this instance I show a fusible grid 19, a resistance coil 20 and a circuit-closing key 521. which are connected with the relay and with a battery 22. A wire 23 extends from the battery to the magnet 3. A

wire 2*]: is connected with the armature lever 16. A wire 25 leads from the contact but top 18 to an instrument 26, which may be either a bell, a lamp or a relay. as desired. From this instrument awire 27 leads to a wire 28, the latter being in communication with the contact button 9. A wire 29 is connected with the wires 27 and 28 and also with a wire 30, the wire last mentioned leading to the battery A wire 31 is connected with the wires 25) and 30 and with the contact button 21 of the key 21. A wire 32 is connected with the battery 22 and with the wire 23, A wire is connected with the key 21 and with a wire 34, the latter leadii'lg to the fusible grid 19. From this fusible grid a wire 35 leads to theresistance coil 20. A wire 36 is. connected with the latter and also with the wire 31 and the contact button 21 A wire 37 is connected with the magnet 3 and with the wire 2 1-. A wire 38 is connected with the wires 24 and 37 and also with the wires 33 and 34. A wire 39 is connected with the armature lever 4 and witha bell 40, the latter being also connected with the wire 32.

'hen the various movable parts occupy their respective normal positions, as indicarted in Fig. 1, a slight amount of current is always flowing through the following circuit :buttery 22, wire 23, magnet 3, wires 37, 38, 34, fusible grid 19, wire 35, resistance coil 20, wires 36, 31 and 30, back to battery 22, The armature lever 16 being unrestrained und easily affected, isthus maintained in its raised position, and hence out of engagement with the contact button 18, as will be understood from Fig. 1. It, now, for any cause, the battery 22 becomes totally inert, the magnet is thereby deenergized end consequently the armature lever 16 drops into its lowermost position; that is, into engagement with the contact button 18. The following circuit is thus completed: battery 22, wire 23, magnet 3, wire 24. armature lever 16, contact button 18, wire 25, instruincnt 26, wires 27, 29 and 30, back to battery 22, This energizes the instrument 26, which may, above indicated, serve the purpose of an alarm. This action takes place whenever the fusible grid 19 is destroyed by lire. Suppose now that the operator depresses the key 21. The following" circuit is thus completed: battery 22, wire 23, magnet 3., wires 37, 38, 33, key 21, contact button 21 and wires 31, 30 to battery 22. This circuit being one of low resistance, causes the magnet 3 to he energized to a considershle extent. The result is that the ormature lever is drawn down into engagement with the contact button 9 and the shutter hook 10 is sctuated and the drop 12 completesthe following; circuit: battery 22,.

wire 32,- bell ll), wire 39, armature lever 4, contact button 9, wires 28, QQ-and 30, back to battery 22, 'This circuit may be used to energize my alarm, relay or instrument of any hind which may be inserted within it.

Referring to the circuits which are closed when either of the nrmatures 4 or 16 comes into eontact'with the eotipernting elements, the "following" is to he noted: The intensity of the current to retain the. armature 16 in the position shown in Fitz, 1 is small: in fact, the intensity of such current-is substantially less when the v armature is in such position than when the armature 4 is brought into the position shown in Fig. 2. When the armature 16 drops, coming into engagement with the contact 18, a circuit through'the magnets 3 is closed, the current which flows,

through these magnets. however, not returning such armature to the position shown in both figures due to-the fact that this armoturc 16 has fallen out of the field of force due to such current; of course. this relation of the armature 16 to the magnetic field due to the current circulating throiwh the eleclro-muonct 3 is determined gravunctrically,

must fall before engaging the contact 18 being determined with respect'to such field of force. I

As will be understood from the foregoing description, the two armature levers 16 and 4 are of unequal degrees of sensitiven ess, the armature lever '16 being lifted with the expenditure ot'less electric energy than that necessary to pull down the armature lever 4. It will thus be seen that the relay as a whole exercises a selectivity as between currents of different strength, a weak current shiftmthe position of the armature lever 1' while a much stronger current is rcquiredto shift the position of the armature lever 4. It will also be noted that the armature levers 4L and 16 are used for independent purposes, and that the armature lever 4; controls not only an electric circuit, but also a drop shutter, which is merely a form of visual signal, its control overthis drop shutter being direct. two armatures mounted respectively at the two ends of the magnet, the sttractionof one armature partially closes the magnetic circuit, but the magnetic circuit is not completely closed that is completely closed. through metal until both armatures are attraded at the same time.

I do not limit myseli to the precise tr-- rangement of the parts here shown and de- It will also be noted that as there are scribed, for the reason that variations may be made therein, without departing from the spirit of my invention, the scope of which is commensurate with mv claims.

. Having thus described my invention, I claim as new and desire to secure by Letters Patent: Y

1. In a relay, the combination of an elecnormal magnetic field of said magnet when the latter is deeinergized, a contact with which the second armature engages on as suming such position, and a circuit including the magnet, said contact and said second armature. I 2. Tn a relay, the combination of a plurality of electro-magnets placed side by side, each electro-magnet having pole faces at the ends, an armature adjacent one end of the clectro-fnng'nets' and normally retracted, a second armature'adjaeent the other end of the eleetro-mafgnets and adapted to be held normally adjacen the pole faces when said eleefro-magnet's are energized, and forming a magnetic path between said magnets, said second armature being adapted to fall-from the adjacent pole faces when the magnets are de'e' nergized, a contact with which the said second armature engages after such :3 fall, and a circuit including said magnets,

said contact and said second armature.

In testimony whereof I have signed my STUART R. STONE.

Witnesses FRANCES G. STONE, CHESTER G. PAIGE. 

